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F. R. BRAINARD.

ELECTRIC PUSH BUTTON. 7 No. 355,858. Patented'Jan. 11, 1887.

- WITNESSES: I [MENTOR QQ f41'- Y By &flrml .mal

ATTORNEY N. PETERS. rmldfimcgraphen Washinglom D. C.

FRED R. BRAINARD, OF ANNAPOLIS, MARYLAND,

ELECTRIC PUSHHBUTTON.

SPECIFICATION forming part of Letters Patent No. 355,858, dated January11, 1887.

Application filed September 3, 1886. Serial No. 212,576. I (No model.)

State of Maryland, have invented certain new and useful Improvements inElectric Push- Buttons, of which the following is a specification. Inmany places the ordinary electric pushbutton cannot be used, as theaction of moist salt-air or other corrosive atmospheric influencesdestroys the action of the ordinary pushbutton in a short time.

The object of my invention is to provide a new and improved push-buttonwhich cannot be affected by atmospheric ,or like influences, and whichis simple in construction.

The invention consists in a casing fastened by a serew, to which onewire is connected, and a rubber or like expansible diaphragm held in thecasing, and to which another wire is connected, whereby when thediaphragm is pressed downward the fastening devices of this "wire arebrought in contact with the above mentioned screw and the circuit isclosed.

In the accompanying drawings, Figure 1 is, a cross-sectional view of myimproved pushbutton. Fig. 2 is a side view of the same, and

Fig. 3 is a top view.

Similar letters of reference indicate corresponding parts.

A circuit block or gasing, A, of rubber or other insulating material, isfastened by means of the screw B, in the countersink of which I one endof the wire 0 is passed, whereby the said wire is held in contact withthe head of the screw, the .wire being passed through an aperture, D, inthe block A. The block A is provided with an upwardly-projectingexternallyscrew-th readed neck, on the top of which a plate'ordiaphragm, E, of rubber or other "like expansible material, is placed,and on said neck of the block A a cap, F, is screwed,

which is provided'with an upwardly-projecting flange, which presses onthe top of the diaphragm and presses said diaphragm firmly on the topedges of the neck, and thereby a firm and absolutely 'air and moisturetight joint is obtained. The other conducting-wire G is held by thescrew II on the under side of the diaphragm or plate E, which screw ispassed through the diaphragm and screws in a plate, J, on the uppersurface of the diaphragm.

By pressing the diaphragm downward the screws H and B are brought incontact and the circuit closed, As soon as the pressure is removed fromthe diaphragm the spring-pressure of the diaphragm causes it to rise,thus breaking the circuit. The wires G and O are preferably twistedtogcth er and passed through the apertures D, said wires being suitablyinsulated.

The push-button is simple in construction,

cheap, and can be more easily applied than.

the usual push-button.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a push-button, the combination, with a blockhaving an upwardly-projecting screwneck, of a rubber plate or diaphragmplaced on the top of the screw-neck, a cap screwed on the screw-neck andholding the rubber plate in place, a-contact-piece on the block, withwhich one of the connecting-wires is in contact, and a contact-piece onthe under side of the diaphragm, substantially as shown and described.

2. In an electric push-button, the combination, with a block having anexternallythreaded screw-neck, of a screw for holding the block inplace, with which screw one of the wires is connected, a rubber plate onthe top of the neck, a screw-cap screwed on the neck and holding therubber plate in place, a plate on the top of the rubber, and held inplace on the same by a screw projecting from the bottom surface of therubber plate, to which screw the other connecting-wire is fast ened,substantially as shown and described.

In testimony that I claim the foregoing as myinvention I have signed myname in presence of two subscribing Witnesses.

FRED It! BRAINARD.

